INSTRUMENTATION
UP TO 5000 G.P.H. ENGINEERED TO THE PURITY YOU NEED Above are two Barnstead MM-6 Mixed-Bed Demineralizers operating in parallel producing 5000 gallons of water per hour of extremely high electrical resistance. They can be operated separately . . . one unit being regenerated while the second remains in operation. Barnstead engineers have simplified Mixed-Bed regeneration to keep operating costs low . . . no special skill in training needed to operate or regenerate. You get economical operation . . . troublefree regeneration and rugged construction to last 30 years. Standard equipment includes: Water pressure gauge, flow meter, valves, eductors, built-in régénérant tanks, all interconnecting piping completely assembled, purity controller which shows when water is up to purity standards and when demineralizer should be regenerated.
FULL I N F O R M A T I O N
AVAILABLE
Write for Catalog #160 describing the complete line of Barnstead Demineralizers including Mixed-Bed, Two-Bed and Four-Bed models. ®
Barnstead STILL AND STERILIZER CO. 9 Lanesville Terrace, Boston 3 1 , Mass. Circle No. 143 on Readers' Service Card 138 A
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ANALYTICAL CHEMISTRY
grange, and other methods. Scientists have always been understandably cautious and suspicious about all but short range extrapolation. In the direction of research and in almost all human affairs decisions must be made. Many of these involve simple interpolation from known facts, others in connection with long range planning, involve extrapolation. In these days of elaborate computers and an advanced state of information theory it is perfectly astonishing how many grave decisions are made, with the facts available and exotic aids for their interpretation at hand, by little more than hunch, or guesswork. In our ignorance, it would be little short of impertinent for us to explain the recent Cuban fiasco, but we continue to be bewildered, as many others must be, by the fact that there is probably no single or even one hundred agencies having the informational resources of the Government of the United States. When we were very young, the mighty Manhattan bridge was being built between Brooklyn and Manhattan. For two decades after its completion, access to this bridge was limited by the bottleneck slums of Brooklyn and Manhattan's lower East Side. Eventually broad access plazas were constructed on each side. The system was inadequate at its inception and needed only interpolation, a process simple to begin with because there were three adjacent bridges for accurate intereomparison. Even plain ordinary people come up with more sensible approaches. The matron who explained to the shoe clerk, "My size is really three, but fours are so comfortable that I always wear fives," really had something. When Mark Twain explained that proficiency in playing poker involved only "simple Christian faith and four aces" he was being delightfully irresponsible as humorists, God bless them, are entitled to be. It is true that decisions are made by men and the decisions of a grave nature are often an intolerable demand upon a human being. Despite this, it is often too apparent that relatively important planning is relegated to ignorant, prejudiced, and willful executives and in such flagrant examples, readily available data are either ignored or misinterpreted. As an example—we have had occasion to visit two large establishments both working in sensitive areas, and with extensive security precautions. In one of these, the employees' cars must be parked as much as a quarter mile from their respective buildings, in which both vehicle and driver are exposed to snow
